CVE-2023-0568 is a critical vulnerability affecting PHP versions 8.0.X before 8.0.28, 8.1.X before 8.1.16, and 8.2.X before 8.2.3. This vulnerability allows core path resolution functions to allocate a buffer that is one byte too small. As a result, when resolving paths close to the system's MAXPATHLEN setting, the byte following the allocated buffer may be overwritten with a NUL value. This can lead to unauthorized data access or modification.
The severity of this vulnerability is classified as high, with a CVSS score of 7.5. The potential impact includes significant risks to confidentiality, integrity, and availability, making it essential for organizations to act swiftly. The vulnerability is exploitable over the network, with a high attack complexity, meaning that while exploitation is feasible, it requires specific conditions to be met.
Organizations should prioritize patching immediately. With public exploit information not yet available, it is crucial to address this vulnerability proactively to prevent potential data breaches or system compromises.
The vulnerability was published on February 16, 2023, and has since been modified. Continuous monitoring and updating of systems will be vital in maintaining security against this and similar vulnerabilities.
Vulnerability Details
In PHP 8.0.X before 8.0.28, 8.1.X before 8.1.16, and 8.2.X before 8.2.3, core path resolution function allocate buffer one byte too small. When resolving paths with lengths close to system MAXPATHLEN setting, this may lead to the byte after the allocated buffer being overwritten with NUL value, which might lead to unauthorized data access or modification.
The CVSS score of 7.5 indicates a high severity level, reflecting the significant risk posed by this vulnerability.
Technical Analysis
The root cause of this vulnerability lies in the mismanagement of buffer allocation in the core path resolution functionality of PHP. This issue can be exploited via network access with high complexity, requiring user interaction to trigger the vulnerability. The necessary privileges to exploit this vulnerability are none, making it easier for attackers to take advantage of this flaw.
Risk & Impact Analysis
Risk to organizations includes potential unauthorized access to sensitive data, modification of data integrity, and disruption of service availability. As this vulnerability can be exploited over the network, it poses an increased risk to publicly accessible PHP applications. Organizations must assess their exposure and prioritize immediate remediation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of PHP are affected by this vulnerability: 8.0.0 to 8.0.28 (exclusive), 8.1.0 to 8.1.16 (exclusive), and 8.2.0 to 8.2.3 (exclusive). Organizations should ensure they are running patched versions.
Mitigation & Remediation
Organizations must patch their PHP installations to versions 8.0.28, 8.1.16, or 8.2.3 or later. For those unable to upgrade immediately, consider implementing workarounds such as restricting access to PHP applications or employing security controls that limit exposure.
For further insights on ensuring application security, organizations can explore resources like application security assessments to identify vulnerabilities and implement effective security measures.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual access patterns, including attempts to access paths close to the MAXPATHLEN setting. Behavioral anomalies and failed access attempts may also indicate attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
This vulnerability highlights the importance of maintaining secure coding practices, particularly with regard to memory management in programming languages. Organizations should regularly conduct penetration testing to identify similar vulnerabilities proactively.
Additionally, organizations should consider following best practices outlined in our penetration testing methodology for a comprehensive approach to security.
To strengthen defenses against similar vulnerabilities, organizations can integrate insights from our vulnerability management program to ensure ongoing resilience against threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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